CEPHALEMYIA. 271 



finding no rest till they get into the water. The only comnnnii- 

 cation which this grub has with the atmosphere is at its anal ex- 

 tremity, and therefore it has no respiratory organs at the anterior 

 extremity. Each plate at the other end is separated by a curved 

 line into two unequal portions, the smallest of which is contiguous 

 to the convex belly, and the largest to the concave back of the 

 animal. This last is distinguished by two hard brown kidney- 

 shaped pieces, a little elevated, with the concave sides turned to- 

 wards each other ; in this siiuis is a single small white spot, which 

 appears to be a spiracle ; in the smallest portion are eight minute 

 circular orifices arranged in a line. Bracy Clark thinks that he 

 has discovered spiracles in this larva in the usual situation, but 

 Kirby believes that they are analogous to the sj)iraculiform tuber- 

 cles of (E. Oi'is." Generally distributed. (E. S. I.) 



Genus II. CEPHALEMYIA. 



Cephalemyia, Clark, CEstrid. (1815); Mcq. ; Westw. ; Blanch. 

 (Edncs p., L. ; F. ; Sclu-. ; Hbst. ; Gmel. ; Don. ; Clark, L. T. ; Lea. ; 

 Latr. ; Fal. ; Meig. 



Corpus subhneare, pubeseens. Caput et tliorax tuberculata. Caput 

 magnum, siibtus tumidura, thorace vix angustius. Fi'ons magna, 

 antice latior. Facies parva, concava, antice angustior. Antcmice 

 brevissimaj. ^Ire sat breves ; vena costalis ala multo brevier ; pra- 

 hrachiaUs cubilali ante ejus apicem jiincta ; discalis transversa obliqua, 

 undulata. Alulce maximre. Abdomen subovatum, thorace paullo an- 

 gustius, non longius. Pedes breves, tenues ; ungues et onychia miuuta. 

 Body nearly linear, pubescent. Head and thorax tuberculate. Head 

 large, tumid beneath, nearly as broad as the thorax. Vertex broad. 

 Front large, widening towards the face. Face small, concave, narrow in 

 front, with a row of short transverse furrows. Genae broad. Eyes of 

 moderate size, nearly elliptical. Antennae extremely short, seated in 

 the cavity of the face ; first and second joints very minute ; third round ; 

 fourth and fifth obsolete ; sixth setiform, stout, bare, thickened towards 

 the base. Thorax much longer than broad, with a slight transverse 

 furrow; scutellum semicircular. //7w^.s rather short ; costal vein end- 

 ing at some distance in front of the tip of the wing; subcostal ending 

 at beyond half the length ; mediastinal ending at a little before two- 

 thirds of the length ; radial ending at beyond five-sixths of the length ; 

 cubital ending at the tip of the costal ; prcchrachlal undulating and in- 

 clined upward shortly after its junction with the discal transverse, and 

 wilted to the cubital at a diort distance from the tip of the latter ; pobra- 

 chial curved towards the hind l^ordcr; discal transverse undulating. 



